President Donald Trump was home at the White House following his nine-day foreign trip.

Spokespeople for the White House and the US Secret Service have not yet commented on what the red lights were, but social media erupted with plenty of wild theories, ranging from a disco dance party to a back-channel code to the Russians.

Some Twitter users joked it was a Trump tanning bed on the fritz or the president unwinding with a particularly intense game of Operation.

It was Trump’s first full day at the White House since his inaugural foreign trip and he was huddling with advisers on the latest developments in the Russia investigation that has now swept up his son-in-law Jared Kushner.